The men's Patagonia Air Flow Tank is able to breathe in simmering temps. The sleeveless version of Patagonia's Air Flow complements the endurance fiend's inability to sit still. This minimalist tank, made of quick-drying 100% polyester (70% recycled) mesh, weighs nearly nothing and provides maximum air permeability along with 15-UPF sun protection. The snag-resistant fabric also features Gladiodor odor control for the garment. Pared-down details include a non-binding crewneck, offset non-chafing seams for unencumbered mobility, and reflective logos on the chest and the center back of neck.

great top when the heat is rising! The material and seamless design make for wear thats hardly even there! It really is like running without a shirt on...but with the benefits of getting some coverage from the sun!

I love my Patagonia Air flow sleeveless top!!! As a 46 year old male I realize that going shirtless could scare women,children and small animals but I also want to stay cool on the trails. The air flow solves this problem with extreme breathability. I like the nice touch of the gel pocket and the reflectable Patagonia logos on the front and back. I have the sleek looking grey colored top that is perfect for the trails unlike my tri-geek cousins who perfer neon colored clothing. The only caveat would be make sure to wear some skin lube to keep your nipples from being rubbed raw from the mesh.

For all you competition junkies out there, this is a great sleeveless t-shirt! I've been training and racing in mine for a couple months now and can honestly say, it's top-notch. I've worn other brands of singlets (sleeveless tops) during competition, but this t-shirt definitely takes 1st place.